Blood pump and blood pump set

Abstract

The utility model provides a blood pump and a blood pump set. The blood pump comprises a spherical pump, and the spherical pump is provided with two working chambers with the volumes alternately changed; a blood bag matched with the cavity of the working chamber is arranged in each working chamber, and the volume of the blood bag alternately sucks blood and discharges blood along with the volume change of the working chamber; each blood bag is provided with a liquid inlet pipe for blood to enter and a liquid discharge pipe for blood discharge; the surface where the upper ports of the liquid inlet pipe and the liquid outlet pipe penetrate through the piston of the spherical pump is arranged as a flow distribution surface; a flow distribution mechanism is formed between the flow distribution surface and a cylinder cover matching surface of the spherical pump, and a liquid inlet pipe and a liquid outlet pipe of the blood bag are selectively communicated with a liquid inlet hole and a liquid outlet hole of the spherical pump in a time-sharing manner through the flow distribution mechanism to form a blood channel; according to the blood pump and the blood pump set, damage to blood cells can be reduced and avoided in the extracorporeal circulation process.

Description

Technical Field

[0001] This patent belongs to the technical field of medical devices, and particularly relates to a blood pump and a blood pump group. Background Art

[0002] Due to clinical treatment needs, hospitals often need to perform extracorporeal circulation on the blood in the bodies of certain patients. During the circulation process, medical treatments such as cooling or filtering the blood are carried out outside the body. A blood pump is a commonly used extracorporeal circulation device that draws human blood out of the body, undergoes extracorporeal circulation, cooling, and filtering, and then slowly injects it back into the body. It is used to stabilize and regulate blood flow during extracorporeal circulation. Especially for patients with encephalopathy, it plays a significant role in the local cooling treatment of the patient's brain blood. Currently, commonly used blood pumps include peristaltic pumps, diaphragm pumps, turbine pumps, etc. Their disadvantages are that when blood passes through peristaltic pumps and diaphragm pumps, due to the squeezing effect, it is easy to cause damage to blood cells, especially to crush blood cells, and cause relatively large damage to larger blood red blood cells and white blood cells. Turbine pumps, due to their high rotational speed, generate a large impact force on blood cells, resulting in an increase in blood temperature and damage to blood cells. Even due to uneven flow rates, some blood may stagnate in the pump, causing blood coagulation and hemolysis, and causing secondary harm to the human body. Summary of the Invention

[0003] This utility model patent provides a blood pump and a blood pump group, which can avoid damaging blood cells during extracorporeal circulation, reduce the increase in blood temperature caused by extracorporeal blood circulation, and prevent blood coagulation and hemolysis caused by extracorporeal blood circulation.

[0004] The technical solution of this utility model patent is as follows:

[0005] A blood pump includes a spherical pump, and the spherical pump has two working chambers with alternately changing volumes; in each working chamber, a blood bag adapted to the cavity of the working chamber is provided, and the volume of the blood bag changes alternately with the volume of the working chamber to suck and discharge blood; each blood bag is provided with an inlet pipe for blood to enter and a discharge pipe for blood to be discharged; the upper ports of the inlet pipe and the discharge pipe are set as the flow distribution surface after penetrating the piston of the spherical pump; a flow distribution mechanism is formed between the flow distribution surface and the mating surface of the cylinder head of the spherical pump; when the spherical pump works, the inlet hole of the spherical pump is selectively connected to the inlet pipe of the blood bag through the flow distribution mechanism to form a blood channel, and the discharge hole of the spherical pump is selectively connected to the discharge pipe of the blood bag through the flow distribution mechanism to form a blood channel.

[0006] The above flow distribution mechanism is a cylindrical surface flow distribution mechanism, and the cylindrical surface flow distribution mechanism includes:

[0007] An outer cylindrical flow distribution surface, taking the outer cylindrical surface where the upper ports of the inlet pipe and the discharge pipe penetrate the piston of the spherical pump as the flow distribution surface, and denoting the flow distribution surface as the outer cylindrical flow distribution surface;

[0008] Inner cylindrical mating surface, an inner cylindrical mating surface adapted to the outer cylindrical flow distribution surface is provided on the cylinder head of the spherical pump; the inner cylindrical mating surface is in close contact with the outer cylindrical flow distribution surface to form a sealed rotational fit; an inlet liquid groove I and a drain liquid groove I are provided on the inner cylindrical mating surface, the upper port of an inlet pipe corresponds to an inlet liquid groove I, the upper port of a drain pipe corresponds to a drain liquid groove I, and the inlet liquid groove I and the drain liquid groove I are respectively communicated with the inlet hole and the drain hole of the spherical pump, so as to form a cylindrical flow distribution mechanism between the outer cylindrical flow distribution surface and the inner cylindrical mating surface.

[0009] The above-mentioned flow distribution mechanism is a planar flow distribution mechanism, and the planar flow distribution mechanism includes:

[0010] Planar flow distribution surface, taking the surface where the upper ports of the inlet pipe and the drain pipe penetrate through the piston of the spherical pump as the flow distribution surface, and denoting the flow distribution surface as the planar flow distribution surface, the planar flow distribution surface is the upper end surface of the piston; an inlet liquid groove II and a drain liquid groove II are provided on the planar flow distribution surface, the upper port of an inlet pipe is communicated with an inlet liquid groove II, and the upper port of a drain pipe is communicated with a drain liquid groove II;

[0011] Planar flow distribution disk, a planar flow distribution disk is provided between the planar flow distribution surface and the cylinder head of the spherical pump; the lower end surface of the planar flow distribution disk is in close contact with the planar flow distribution surface to form a sealed rotational fit, and the planar flow distribution disk is elastically pressed between the cylinder head of the spherical pump and the planar flow distribution surface; an inlet and a drain are provided on the planar flow distribution disk, an inlet corresponds to an inlet liquid groove II, a drain corresponds to a drain liquid groove II, and the inlet and the drain are respectively communicated with the inlet hole and the drain hole of the spherical pump, so as to form a planar flow distribution mechanism between the planar flow distribution surface and the planar flow distribution disk.

[0012] The above-mentioned blood sac is made of a soft elastic material; the above-mentioned blood sac is fixedly connected to the upper end surface and the lower end surface of the working chamber respectively.

[0013] The inlet pipe on the above-mentioned blood sac is arranged at the front end in the rotation direction of the blood sac along with the piston, and the drain pipe of the above-mentioned blood sac is arranged at the rear end in the rotation direction of the blood sac along with the piston.

[0014] A blood passage is provided in the above-mentioned blood sac, the inlet of the blood passage is communicated with the inlet pipe, and the outlet of the blood passage is communicated with the drain pipe.

[0015] The above-mentioned spherical pump includes:

[0016] Cylinder block, having a hemispherical inner cavity, and a through hole penetrating outside the cylinder is provided on the cylinder block;

[0017] The turntable has a spherical outer peripheral surface. The spherical outer peripheral surface and the hemispherical inner cavity have the same center of the sphere and form a sealed dynamic fit. There are two side surfaces at a certain angle on the upper part of the turntable, and a turntable pin seat is provided in the center of the two side surfaces. A turntable shaft protrudes from the center of the lower end of the turntable. The turntable shaft passes through the center of the sphere of the spherical outer peripheral surface, and a sliding shoe is fixed to the lower end of the turntable shaft.

[0018] The piston has a cylindrical outer peripheral surface. Taking the central axis of the cylindrical outer peripheral surface as the piston axis, a piston pin seat is fixed to the lower end surface of the piston. The piston pin seat and the turntable pin seat are connected by a cylindrical surface hinge, and the piston axis passes through the center of the sphere of the spherical outer peripheral surface of the turntable.

[0019] The cylinder head has an inner cylindrical hole adapted to the cylindrical outer peripheral surface of the piston. The lower end of the cylinder head is fixedly connected to the upper end of the cylinder block. The cylinder head is provided with a liquid inlet hole and a liquid outlet hole.

[0020] The main shaft and the main shaft bracket. The main shaft bracket is fixedly connected to the lower end of the cylinder block. The main shaft bracket provides support for the rotation of the main shaft. A chute is provided on the upper end surface of the main shaft. The sliding shoe at the lower part of the turntable is placed in the chute to form a sliding fit. The lower end of the main shaft extends out of the cylinder block through the through hole at the lower end of the cylinder block and is connected to the driving element.

[0021] Among them, the axes of the main shaft and the piston both pass through the center of the sphere of the spherical outer peripheral surface; the piston axis and the turntable shaft axis form the same angle α with the axis of the main shaft; the two side surfaces of the sliding shoe that are parallel are symmetrically arranged on both sides of the axis of the turntable shaft and are parallel to the axis of the cylindrical surface hinge. When the main shaft drives the turntable and the piston to rotate, the sliding shoe reciprocates in the chute, and two working chambers with alternately changing volumes are formed between the upper end surface of the turntable, the lower end surface of the piston and the hemispherical inner cavity of the cylinder block.

[0022] A blood pump group includes N of the above-mentioned blood pumps. The liquid inlet holes of the N blood pumps are all connected to the same liquid inlet pipe, and the liquid outlet holes of the N blood pumps are all connected to the same liquid outlet pipe; where N is a positive integer greater than or equal to 1.

[0023] The N above-mentioned blood pumps are connected by the same driving mechanism. The above-mentioned driving mechanism is used to drive the N blood pumps to rotate in coordination; the initial phase angles of the blood pumps in the above-mentioned blood pump group differ by 180 / N degrees in sequence.

[0024] The above-mentioned driving mechanism is a gear mechanism. The main shaft of each of the above-mentioned blood pumps is connected to a driven gear. The driven gear meshes with the driving gear. The driving gear is driven by a motor, and the driving gear simultaneously drives several driven gears and the main shafts of the blood pumps to rotate in coordination.

[0025] Advantages of this patent: 1) By providing a blood sac adapted to the spherical pump working chamber cavity, the blood sac is squeezed by the change of the volume of the spherical pump working chamber. The squeezing process is slow, and the blood sac is evenly stressed, avoiding damage to red blood cells and white blood cells caused by local stress. The squeezing degree of the blood is small. At the same time, the inlet hole and the drain hole provided on the spherical pump are connected to the blood sac through the flow distribution mechanism, avoiding the squeezing of the valve body on red blood cells and white blood cells when the blood passes through the valve, and reducing the damage to formed elements such as red blood cells and white blood cells. 2) For the blood pump of this patent, when the single pump has a flow rate of 100 ml per minute, the ball diameter of the pump turntable is only 30 mm, and the rotation speed is 60 revolutions per minute; if it is a blood pump group combined with four pumps, the rotation speed per minute only needs to be 15 revolutions. Therefore, the blood pump provided by this patent has a low rotation speed, no eddy current, and avoids the increase of blood temperature caused by pump heating and damage to blood cells. 3) Since the blood sequentially flows in the inlet pipe of the blood sac, the blood sac, the drain pipe of the blood sac, and the flow distribution mechanism, it avoids the retention of blood during the circulation process, and there will be no coagulation and hemolysis phenomena. Description of the Drawings

[0026] Figure 1 It is the front view of the blood pump in Embodiment 1 of this patent.

[0027] Figure 2 It is the top view of the blood pump in Embodiment 1 of this patent.

[0028] Figure 3 It is Figure 2 the A-A cross-sectional view in

[0029] Figure 4 It is the schematic diagram of the blood sac structure in this patent.

[0030] Figure 5 It is the schematic diagram of the cylinder head in Embodiment 1 of this patent.

[0031] Figure 6 It is Figure 5 the D-D cross-sectional view in

[0032] Figure 7 It is Figure 5 the B-B cross-sectional view in

[0033] Figure 8 It is the schematic diagram of the cylinder block structure in Embodiment 1 of this patent.

[0034] Figure 9 It is the schematic diagram of the piston structure in Embodiment 1 of this patent.

[0035] Figure 10 It is the schematic diagram of the turntable structure in Embodiment 1 of this patent.

[0036] Figure 11 It is the schematic diagram of the spherical pump rotor structure in Embodiment 1 of this patent.

[0037] Figure 12 This is the front view of the blood pump in Embodiment 2 of this patent.

[0038] Figure 13 is Figure 12 the N-N sectional view in

[0039] Figure 14 This is the schematic diagram of the A cylinder head in Embodiment 2 of this patent.

[0040] Figure 15 This is the schematic diagram of the A piston in Embodiment 2 of this patent.

[0041] Figure 16 This is the front view of the rotor structure in Embodiment 2 of this patent.

[0042] Figure 17 This is the top view of the rotor structure in Embodiment 2 of this patent.

[0043] Figure 18 This is the schematic diagram of the planar distribution plate structure in Embodiment 2 of this patent.

[0044] Figure 19 This is the schematic diagram of the blood pump group structure in Embodiment 3 of this patent.

[0045] Figure 20 This is the schematic diagram of the driving mechanism in the blood pump group in Embodiment 3 of this patent.

[0046] Explanation of reference numerals:

[0047] 1. Blood sac; 1a. Blood passage; 2. Inlet pipe; 2a. Upper port of the inlet pipe; 3. Drain pipe; 3a. Upper port of the drain pipe; 4. Cylinder block; 5. Turntable; 501. Turntable pin seat; 502. Turntable shaft; 503. Slide shoe; 6. Piston; 601. Piston pin seat; 602. First stepped cylinder; 603. Second stepped cylinder; 7. Cylinder head; 701. Inlet hole; 702. Drain hole; 703. Inlet groove I; 704. Drain groove I; 8. Main shaft; 801. Slide groove; 9. Main shaft bracket; 10. Bearing; 11. Hoop; 12. Fixing piece; 12a. Buckle; 13. Sealing ring; 14. A piston; 1401. Inlet groove II; 1402. Drain groove II; 1403. A piston pin seat; 15. A cylinder head; 16. Planar distribution plate; 1601. Inlet port; 1602. Drain port; 1603. Inlet connecting pipe; 1604. Drain connecting pipe; 17. Elastic gasket;

[0048] 100. Blood pump; 200. Gearbox; 2001. Driving gear; 2002. Driven gear. Detailed implementation manners

[0049] The following combinesFigures 1 to 20 A specific embodiment of this patent will be described in detail, but it should be understood that the protection scope of this patent is not limited by the specific embodiment.

[0050] Example 1:

[0051] Example 1 of this patent provides a blood pump. As Figure 1 shown in the front view of the blood pump, the blood pump includes a spherical pump, and the spherical pump has two working chambers with alternately changing volumes; in each working chamber, a blood sac 1 adapted to the cavity of the working chamber is provided. The volume of the blood sac 1 follows the change of the volume of the working chamber and alternately sucks and discharges blood; on each blood sac 1, a liquid inlet pipe 2 for blood to enter and a liquid discharge pipe 3 for blood to discharge are provided; the upper ports of the liquid inlet pipe 2 and the liquid discharge pipe 3 penetrate the surface where the piston of the spherical pump is located and are set as the flow distribution surface; a flow distribution mechanism is formed between the flow distribution surface and the mating surface of the cylinder head of the spherical pump; when the spherical pump works, the liquid inlet hole of the spherical pump is selectively connected with the liquid inlet pipe of the blood sac through the flow distribution mechanism to form a blood channel, and the liquid discharge hole of the spherical pump is selectively connected with the liquid discharge pipe of the blood sac through the flow distribution mechanism to form a blood channel.

[0052] It should be noted that the flow distribution mechanism in this embodiment is a cylindrical surface flow distribution mechanism. As Figure 2 shown in the top view of the blood pump, the cylindrical surface flow distribution mechanism includes an outer cylindrical flow distribution surface and an inner cylindrical mating surface. As Figure 3 shown, the outer cylindrical surface where the upper ports of the liquid inlet pipe 2 and the liquid discharge pipe 3 penetrate the piston 6 of the spherical pump is used as the flow distribution surface, and the flow distribution surface is denoted as the outer cylindrical flow distribution surface; on the cylinder head 7 of the spherical pump, an inner cylindrical mating surface adapted to the outer cylindrical flow distribution surface is provided; the inner cylindrical mating surface is in close contact with the outer cylindrical flow distribution surface and forms a sealed rotational fit; on the inner cylindrical mating surface, a liquid inlet groove Ⅰ703 and a liquid discharge groove Ⅰ704 are provided. The upper port of one liquid inlet pipe 2 corresponds to one liquid inlet groove Ⅰ703, and the upper port of one liquid discharge pipe 3 corresponds to one liquid discharge groove Ⅰ704. The liquid inlet groove Ⅰ703 and the liquid discharge groove Ⅰ704 are respectively communicated with the liquid inlet hole 701 and the liquid discharge hole 702 of the spherical pump, so as to form a cylindrical surface flow distribution mechanism between the outer cylindrical flow distribution surface and the inner cylindrical mating surface.

[0053] Further, the lengths of the liquid inlet tank I 703 and the liquid discharge tank I 704 are both adapted to the volume of blood contained in the blood sac 1. During the rotation of the spherical pump, when the volume of one blood sac 1 starts to increase and it begins to suck blood, the starting end of the liquid inlet tank I 703 is connected to the upper port of the liquid inlet pipe 2. When it rotates to the point where the volume of this blood sac 1 reaches its maximum and the blood suction is completed, the end of the liquid inlet tank I 703 is connected to the upper port of the liquid inlet pipe 2. During the process of this blood sac 1 sucking blood, the liquid inlet tank I 703 remains continuously connected to the upper port of the liquid inlet pipe 2. At the same time, when the volume of the other blood sac 1 starts to decrease and it begins to discharge liquid, the starting end of the liquid discharge tank I 704 is connected to the upper port of the liquid discharge pipe 3. When it rotates to the point where the volume of this blood sac 1 reaches its minimum and the liquid discharge is completed, the end of the liquid inlet tank I 703 is connected to the upper port of the liquid inlet pipe 2. During the process of this blood sac 1 discharging blood, the liquid discharge tank I 704 remains continuously connected to the upper port of the liquid discharge pipe 3.

[0054] Specifically, as Figure 4 shown, which is a schematic diagram of the blood sac structure. The blood sac 1 placed in the first working chamber cavity is denoted as blood sac A, and the blood sac 1 placed in the second working chamber cavity is denoted as blood sac B. Both blood sac A and blood sac B are provided with a liquid inlet pipe 2 and a liquid discharge pipe 3. At the same time, since the upper port 2a of one liquid inlet pipe corresponds to one liquid inlet tank I 703, and the upper port 3a of one liquid discharge pipe corresponds to one liquid discharge tank I 704, the number of both the liquid inlet tank I 703 and the liquid discharge tank I 704 is two. When the spherical pump works, it will drive the blood sac A, blood sac B, and the piston 6 to rotate synchronously. Since blood sac A and blood sac B alternately suck and discharge blood, when the upper port 2a of the liquid inlet pipe of blood sac A is connected to its corresponding liquid inlet tank I 703, the blood entering through the liquid inlet hole of the spherical pump will enter blood sac A through the liquid inlet tank I 703. At this time, the upper port 3a of the liquid discharge pipe of blood sac A is not connected to the corresponding liquid discharge tank I 704, and the upper port 3a of the liquid discharge pipe of blood sac A contacts the inner wall of the mating surface of the cylinder head 7. At the same time, the length of the liquid inlet tank I 703 is adapted to the volume of blood contained in blood sac A. When the blood suction of blood sac A is completed, the upper port 2a of the liquid inlet pipe of blood sac A is no longer connected to its corresponding liquid inlet tank I 703 but contacts the inner wall of the mating surface of the cylinder head, and at this time, the blood suction process of blood sac A is completed.

[0055] After the blood suction process of blood sac A is completed, when the spherical pump continues to rotate, blood sac A enters the liquid discharge process. The upper port 3a of the liquid discharge pipe of blood sac A is connected to the corresponding liquid discharge tank I 704. At this time, the blood in blood sac A will enter the liquid discharge hole 702 of the spherical pump through the liquid discharge tank I 704 and be discharged through the liquid discharge hole 702 of the spherical pump. At the same time, the length of the liquid discharge tank I 704 is adapted to the volume of blood contained in blood sac A. When blood sac A discharges liquid, the upper port 2a of the liquid inlet pipe of blood sac A is not connected to the corresponding liquid inlet tank I 703. At the same time, when blood sac A enters the liquid discharge process, blood sac B enters the blood suction process, and the blood suction process of blood sac B is the same as that of blood sac A, and the liquid discharge process of blood sac B is the same as the liquid discharge process of blood sac B.

[0056] Further, as Figure 4 shown, the liquid inlet pipe on the blood sac 1 is arranged at the front end of the blood sac 1 along the rotation direction of the piston 6, and the liquid discharge pipe 3 of the blood sac 1 is arranged at the rear end of the blood sac 1 along the rotation direction of the piston 6; the upper port 2a of the liquid inlet pipe of the blood sac slides along the liquid inlet groove I703 in the same direction as the rotation direction of the spherical pump. Since the diameter of the blood passage is small, the flow rate is small and the flow velocity is slow. Therefore, the liquid inlet pipe 2 on the blood sac 1 is arranged at the front end of the blood sac along the rotation direction of the piston, and the liquid discharge pipe 3 of the blood sac 1 is arranged at the rear end of the blood sac 1 along the rotation direction of the piston 6. The advantage of this is that when the flow velocity is small, the blood entering the blood sac through the liquid suction pipe is vibrated and stirred, facilitating the smooth flow of blood.

[0057] Further, the shape of the blood sac 1 in this embodiment changes with the change of the working chamber cavity. Therefore, the blood sac 1 is preferably made of a soft elastic material. When the blood sac 1 is made of a soft and elastic material, the blood sac 1 is stretched and unfolded as the volume of the working chamber increases, and the blood sac 1 is squeezed as the volume of the working chamber decreases; when the blood sac 1 is made of an elastic material, the blood sac 1 is elastically stretched as the volume of the working chamber increases, and the blood sac 1 elastically contracts as the volume of the working chamber decreases. The blood sac and the liquid inlet pipe 2 and the liquid discharge pipe 3 thereon can be integrally manufactured.

[0058] It should be noted that the spherical pump in this embodiment includes a cylinder block 4, a turntable 5, a piston 6, a cylinder head 7, a main shaft 8, and a main shaft bracket 9; the cylinder block 4, the cylinder head 7, and the main shaft bracket 9 are fixedly connected to form the spherical pump housing, that is, the spherical pump stator; the piston 6, the turntable 5, and the main shaft 8 are sequentially connected to form the spherical pump rotor, and the spherical pump rotor is placed inside the spherical pump stator, as Figure 11 shown, which is a schematic diagram of the spherical pump rotor structure in this embodiment.

[0059] Further, the upper end surface of the working chamber of the spherical pump in this embodiment is the lower surface of the piston 6, and the lower end surface of the working chamber is the upper part of the turntable 5 provided with two side surfaces at a certain angle, as Figure 4 shown, the upper end surface of the blood sac 1 is fixedly connected to the lower surface of the piston 6 through a fixing member 12, and the lower end surface of the blood sac 1 is also fixedly connected to the upper side surface of the turntable 5 through the fixing member 12, that is, the blood sac 1 is fixedly connected to the upper end surface and the lower end surface of the working chamber respectively. In this embodiment, the form of snap-in connection is adopted for the fixed connection, as Figure 4 shown, a snap is fixed on the fixing member 12, and clamping grooves adapted to the snap are provided on both the piston 6 and the turntable 5.

[0060] Preferably, as Figure 4As shown in the figure, a blood passage 1a can be provided in the blood sac 1. The inlet of the blood passage 1a is communicated with the liquid inlet pipe 2, and the outlet of the blood passage 1a is communicated with the liquid discharge pipe 3. The blood entering the blood sac 1 first enters the blood passage 1a from the liquid inlet pipe 2 and then is discharged through the liquid discharge pipe 3. The blood will not stagnate in the blood sac 1, avoiding blood coagulation caused by uneven flow velocity.

[0061] As Figure 8 shown, it is a schematic diagram of the cylinder block structure in this embodiment. The cylinder block 4 has a hemispherical inner cavity. There is a through hole penetrating outside the cylinder on the cylinder block 4, and a turntable 5 is provided in the cylinder block 4; As Figure 10 shown, it is a schematic diagram of the turntable structure in this embodiment. The turntable 5 has a spherical outer peripheral surface. The spherical outer peripheral surface of the turntable 5 and the hemispherical inner cavity of the cylinder block 4 have the same center of the sphere and form a sealed dynamic fit. There are two side surfaces at a certain angle on the upper part of the turntable 5. A turntable pin seat 501 is provided in the center of the two side surfaces. The turntable pin seat 501 is a semi-cylindrical groove structure. There is a protruding turntable shaft 502 at the center of the lower end of the turntable 5. The turntable shaft 502 passes through the center of the sphere of the spherical outer peripheral surface, and a sliding shoe 503 is fixed at the lower end of the turntable shaft 502.

[0062] As Figure 9 shown, it is a schematic diagram of the piston structure in this embodiment. The piston 6 has a cylindrical outer peripheral surface. A piston pin seat 601 is fixed on the lower end surface of the piston 6. The piston pin seat 601 is a semi-cylindrical structure. The semi-cylinder of the piston pin seat 601 is inserted into the semi-cylindrical groove of the turntable pin seat 501 to form a cylindrical surface hinge connection. There are 4 through holes for the liquid inlet pipe 2 and the liquid discharge pipe 3 on the blood sac 1 provided on the piston 6. One end of the through hole is provided on the lower surface of the piston, and the other port is provided on the outer cylindrical surface of the first stepped cylinder 602. The piston 6 includes a first stepped cylinder 602 and a second stepped cylinder 603 with coincident central axes. The upper port 2a of the liquid inlet pipe of the blood sac 1 and the upper port 3a of the liquid discharge pipe penetrate the outer cylindrical surface where they are located after passing through the first stepped cylinder 602 as the flow distribution surface, and this flow distribution surface is denoted as the outer cylindrical flow distribution surface; The bottom diameter of the first stepped cylinder 602 is smaller than the bottom diameter of the second stepped cylinder 603. The common central axis of the first stepped cylinder 602 and the second stepped cylinder 603 is used as the piston axis, and the piston axis passes through the center of the sphere of the spherical outer peripheral surface of the turntable 5.

[0063] As Figure 5 shown, it is a schematic diagram of the cylinder head 7 structure in this embodiment. A flange is provided between the lower end of the cylinder head 7 and the upper end of the cylinder block 4 and is fixedly connected by a hoop 11. There are a liquid inlet hole 701 and a liquid discharge hole 702 on the cylinder head 7. In this embodiment, as Figure 2As shown, the liquid inlet hole 701 provided on the cylinder head 7 is the liquid inlet hole of the spherical pump, and the liquid discharge hole 702 provided on the cylinder head 7 is the liquid discharge hole of the spherical pump; the cylinder head 7 has a first inner cylindrical hole adapted to the first stepped cylinder 602 of the piston 6, and the cylinder head 7 has a second inner cylindrical hole adapted to the second stepped cylinder 603 of the piston 6. When the spherical pump works, a dynamic fit is formed between the upper annular surface of the second stepped cylinder 603 and the lower annular surface of the second inner cylindrical hole; the surface where the first inner cylindrical hole is located is adapted to the outer cylindrical flow distribution surface. The surface where the first inner cylindrical hole is located is denoted as the inner cylindrical mating surface. An inlet liquid groove I 703 and a discharge liquid groove I 704 are provided on the inner cylindrical mating surface, and the inner cylindrical mating surface is in close contact with the outer cylindrical flow distribution surface to form a sealed rotational fit. It should be noted that, as Figure 7 shown, the inlet liquid groove I 703 provided on the inner cylindrical mating surface is connected to the liquid inlet hole 701 of the spherical pump through a liquid inlet channel opened in the cylinder head. Preferably, there is one liquid inlet hole of the spherical pump, so one inlet liquid groove I 703 corresponds to one liquid inlet channel, and each liquid inlet channel is connected to one liquid inlet hole 701 provided on the cylinder head 7; as Figure 6 shown, the discharge liquid groove I 704 provided on the inner cylindrical mating surface is connected to the liquid discharge hole of the spherical pump through a liquid discharge channel opened in the cylinder head. Preferably, there is one liquid discharge hole of the spherical pump, so one discharge liquid groove I 704 corresponds to one liquid discharge channel, and each liquid discharge channel is connected to one liquid discharge hole 702 provided on the cylinder head 7; it should be noted that the liquid inlet hole of the spherical pump is the liquid inlet hole of the blood pump, and the liquid discharge hole of the spherical pump is the liquid discharge hole of the blood pump.

[0064] Preferably, as Figure 11 shown, a plurality of sealing rings 13 are provided between the first stepped cylinder 602 and the first inner cylindrical hole. The function of providing multiple sealing rings 13 is to seal the liquid within a certain range. The cylinder head 7 has a second inner cylindrical hole adapted to the second stepped cylinder 603 of the piston 6, and a plurality of sealing rings 13 are also provided between the second stepped cylinder 603 and the second inner cylindrical hole to prevent external contaminants from entering.

[0065] As Figure 3 shown, the spherical pump further includes a main shaft bracket 9. The main shaft bracket 9 is fixedly connected to the lower end of the cylinder block 4. The specific fixed connection method can be selected as screw connection. The main shaft bracket 9 provides support for the rotation of the main shaft 8. The axis of the main shaft 8 passes through the center of the spherical outer peripheral surface of the turntable 5, and the included angle between the axis of the main shaft 8 and the axis of the piston is α. The range of α is 5 to 25 degrees, preferably 15 degrees, 17.5 degrees, 20 degrees. A chute 801 adapted to the sliding shoe 503 is provided on the upper end surface of the main shaft 8. A sliding shoe gasket is provided on the side surface of the chute 801 in contact with the sliding shoe 503 on the inner side. The sliding shoe gasket is preferably made of ceramic material. The lower end of the main shaft 8 is connected to the driving element.

[0066] Among them, the axes of the main shaft 8 and the piston both pass through the center of the spherical outer surface of the turntable 5; the angles between the axis of the piston and the axis of the turntable shaft 502 and the axis of the main shaft are the same, both being α; the two parallel side faces of the slipper 503 are symmetrically arranged on both sides of the axis of the turntable and are parallel to the axis of the cylindrical hinge; when the main shaft 8 drives the turntable 5 and the piston 6 to rotate, the slipper 503 reciprocates in the chute 801, and the piston 6 and the turntable 5 swing relative to each other, forming two working chambers with alternately changing volumes between the upper end surface of the turntable 5, the lower surface of the piston 6 and the hemispherical inner cavity of the cylinder block 4; when the main shaft 8 rotates one week, the piston 6 rotates one week around the axis of the piston, and the piston 6 reciprocates and swings once around the axis of the turntable pin seat 501 relative to the turntable 5. At the same time, the slipper 503 of the turntable 5 reciprocates once in the chute 801 provided on the upper end surface of the main shaft 8, and the volumes of the two working chambers each undergo a process of alternately changing; when the main shaft 8 drives the turntable 5 and the piston 6 to rotate, it will simultaneously drive the blood sac 1 in the cavity of the working chamber to rotate synchronously, and the blood sac 1 alternately inhales and discharges blood as the volume of the working chamber changes.

[0067] Embodiment 2:

[0068] As Figure 12 shown, it is the front view of the blood pump in this embodiment. The difference between this embodiment and Embodiment 1 is that: the flow distribution mechanism in this embodiment is a planar flow distribution mechanism, and the planar flow distribution mechanism includes a planar flow distribution surface and a planar flow distribution disk; as Figure 13 shown, it is the sectional view of the blood pump. In this embodiment, the piston of the spherical pump is denoted as the A piston, and the cylinder head of the spherical pump is denoted as the A cylinder head; as Figure 14 shown, it is the schematic diagram of the A cylinder head of the spherical pump in this embodiment; as Figure 15 shown, it is the schematic diagram of the A piston of the spherical pump in this embodiment; as Figure 16 shown, it is the schematic diagram of the rotor structure of the spherical pump in this embodiment.

[0069] The planar flow distribution surface: The surface where the upper ports of the liquid inlet pipe and the liquid discharge pipe penetrate through the A piston 14 of the spherical pump is used as the flow distribution surface, and the flow distribution surface is denoted as the planar flow distribution surface. As Figure 15 shown, it is the schematic diagram of the A piston in this embodiment, and the planar flow distribution surface is the upper end surface of the A piston 14; as Figure 17As shown in the figure, an inlet liquid groove II 1401 and a drain liquid groove II 1402 are provided on the planar distribution surface. The upper port 2a of an inlet liquid pipe is communicated with an inlet liquid groove II 1401, and the upper port 3a of a drain liquid pipe is communicated with a drain liquid groove II 1402; Planar distribution disc, a planar distribution disc 16 is provided between the planar distribution surface and the A cylinder head 15 of the spherical pump; The lower end surface of the planar distribution disc 16 is attached to the planar distribution surface and forms a sealed rotational fit. An elastic gasket 19 is arranged between the planar distribution disc and the cylinder head, so that the planar distribution disc 16 is elastically pressed between the A cylinder head 15 and the planar distribution surface; An inlet liquid port 1601 and a drain liquid port 1602 are provided on the planar distribution disc. An inlet liquid port 1601 corresponds to an inlet liquid groove 1401, and a drain liquid port 1602 corresponds to a drain liquid groove 1402. The inlet liquid port 1601 and the drain liquid port 1602 are respectively communicated with the inlet liquid hole and the drain liquid hole of the spherical pump through an inlet liquid connecting pipe and a drain liquid connecting pipe, so as to form a planar distribution mechanism between the planar distribution surface and the planar distribution disc.

[0070] Further, the lengths of the inlet liquid groove II and the drain liquid groove II are both adapted to the volume of the blood contained in the blood sac.

[0071] Specifically, the blood sac placed in the first working chamber cavity is denoted as blood sac C, and the blood sac placed in the second working chamber cavity is denoted as blood sac D. Both blood sac C and blood sac D are provided with an inlet liquid pipe and a drain liquid pipe. At the same time, since an inlet liquid pipe 2 corresponds to an inlet liquid groove II 1401 and a drain liquid pipe 3 corresponds to a drain liquid groove II 1402, the numbers of the inlet liquid groove II 1401 and the drain liquid groove II 1402 are both two; When the spherical pump works, it will drive the blood sac C, the blood sac D and the C piston 14 to rotate synchronously. Since the blood sac C and the blood sac D alternately suck and drain blood, when the upper port of the inlet liquid pipe of the blood sac C is connected to its corresponding inlet liquid port through an inlet liquid groove, the blood entering through the inlet liquid hole of the spherical pump will sequentially pass through the inlet liquid connecting pipe, the inlet liquid port, the inlet liquid groove I 1401 and the inlet liquid pipe and enter the blood sac C. At this time, the upper port of the drain liquid pipe of the blood sac C is not connected to the corresponding drain liquid port. The drain liquid groove connected to the upper port of the drain liquid pipe of the blood sac C contacts the lower end surface of the planar distribution disc. At the same time, the length of the inlet liquid groove II 1401 is adapted to the volume of the blood contained in the blood sac C. When the blood sac C finishes sucking liquid, the inlet liquid port on the lower end surface of the planar distribution disc is no longer connected to its corresponding inlet liquid groove II 1401, but the inlet liquid groove II 1401 contacts the lower end surface of the planar distribution disc. At this time, the liquid suction process of the blood sac C is completed.

[0072] When the liquid suction process of the blood sac C is completed and the spherical pump continues to rotate, the blood sac C enters the liquid discharge process. The upper port of the liquid discharge pipe of the blood sac C is connected to the corresponding liquid discharge port on the lower end face of the planar flow distribution disc through the corresponding liquid discharge groove II 1402. At this time, the blood in the blood sac C will sequentially pass through the liquid discharge pipe, the upper port of the liquid discharge pipe, the liquid discharge groove II 1402, the liquid discharge port, and the liquid discharge connecting pipe and enter the liquid discharge hole of the spherical pump, and be discharged through the liquid discharge hole of the spherical pump. At the same time, the length of the liquid discharge groove II 1402 is adapted to the volume of the blood accommodated in the blood sac C; when the blood sac C discharges liquid, the liquid inlet groove II 1402 connected to the upper port of the liquid inlet pipe 2 of the blood sac C is not connected to the liquid inlet port on the planar flow distribution disc; at the same time, when the blood sac C enters the liquid discharge process, the blood sac D enters the liquid suction process. The liquid suction process of the blood sac D is the same as that of the blood sac C, and the liquid discharge process of the blood sac D is the same as that of the blood sac D.

[0073] Further, the structure of the blood sac in this embodiment is the same as that of the blood sac in Embodiment 1. As Figure 4 shown, the direction in which the upper port of the liquid inlet pipe of the blood sac 1 slides along the liquid inlet groove II 1401 is the same as the rotation direction of the spherical pump. Since the blood is a flowing liquid when it enters from the liquid inlet hole of the spherical pump, the upper port of the liquid inlet pipe 2 of the blood sac 1 advances along the direction of blood inflow to facilitate the smoother entry of the blood into the blood sac 1. In this embodiment, the material, structure, and fixing method of the blood sac 1 with the working chamber cavity are the same as those in Embodiment 1, and will not be elaborated here.

[0074] It should be noted that the structures of the A piston 14 and the A cylinder head 15 of the spherical pump in this embodiment are different from those in Embodiment 1. The A piston of the spherical pump in this embodiment is a cylindrical structure as a whole. The A piston has a cylindrical outer peripheral surface and an upper end plane. An A piston pin seat 1403 is fixed to the lower end surface of the A piston. The A piston pin seat 1403 forms a cylindrical hinge connection with the turntable pin seat 501; the upper end surfaces where the upper ports of the liquid inlet pipe 2 and the liquid discharge pipe 3 of the blood sac 1 penetrate through the A piston of the spherical pump are used as the planar flow distribution surface, that is, the upper end surface of the A piston is used as the planar flow distribution surface. In this embodiment, a planar flow distribution disc 16 is provided between the planar flow distribution surface and the A cylinder head of the spherical pump. The lower end surface of the planar flow distribution disc 16 is in close contact with the planar flow distribution surface of the A piston and forms a sealed rotational fit. The planar flow distribution disc 16 is elastically pressed between the A cylinder head 15 and the planar flow distribution surface. An inlet port 1601 and a discharge port 1602 are provided on the planar flow distribution disc 16. One inlet port is connected to one liquid inlet groove II 1401, and one discharge port is connected to one liquid discharge groove II 1402. The inlet port 1601 and the discharge port 1602 are respectively connected to the liquid inlet hole and the liquid discharge hole of the spherical pump, so as to form a planar flow distribution mechanism between the planar flow distribution surface and the planar flow distribution disc.

[0075] In this embodiment, as Figure 18As shown, this is the structure of the planar flow distribution disk in this embodiment. The inlet 1601 on the planar flow distribution disk 16 is fixedly connected to an inlet connecting pipe 1603, and the drain outlet 1602Ⅱ on the planar flow distribution disk 16 is fixedly connected to a drain connecting pipe 1604. There are two inlet connecting pipe through-holes and two drain connecting pipe through-holes on the A cylinder head 15. After the two inlet connecting pipes extend out of the A cylinder head through the two inlet connecting pipe through-holes respectively, they are connected through a tee to form an inlet main pipe, and this inlet main pipe serves as the inlet hole of the spherical pump; after the two drain connecting pipes extend out of the A cylinder head through the two drain connecting pipe through-holes respectively, they are connected through a tee to form a drain main pipe, and this drain main pipe serves as the drain hole of the spherical pump; it should be noted that the inlet hole of the spherical pump is the inlet hole of the blood pump, and the drain hole of the spherical pump is the drain hole of the blood pump.

[0076] The working principle of the spherical pump in this embodiment is the same as that in Embodiment 1. In terms of structure, except for the above differences, the rest of Embodiment 2 is the same as that in Embodiment 1. When the spherical pump works, it will drive the piston to rotate in the cylinder head, and at the same time drive the blood sac in the working chamber cavity to rotate synchronously. The blood sac alternately inhales and discharges blood as the volume of the working chamber changes. As an extension of this patent, any structure that forms an alternately variable-volume working chamber through a mechanism, the blood sac alternately inhales and discharges liquid in the working chamber as the volume of the working chamber changes, and forms a blood circulation through the flow distribution mechanism described in this patent, which is similar in principle and structure to this patent, also falls within the protection scope of this patent.

[0077] Embodiment 3:

[0078] A blood pump group provided in Embodiment 3 of this application includes N blood pumps 100. As Figure 19 shown, it is a schematic structural diagram of the blood pump group. Since this blood pump group adopts all the technical solutions of all embodiments of a blood pump, it has all the beneficial effects brought by the technical solutions of the above-mentioned blood pump 100.

[0079] As Figure 20 shown, it is a schematic diagram of the driving mechanism in the blood pump group. After the N blood pumps 100 are combined, they are connected through the same driving mechanism. The driving mechanism is used to drive the N blood pumps to rotate synchronously. The above driving mechanism is a gear mechanism. The motor drives the driving gear 2001, and the driving gear 2001 simultaneously drives several driven gears 2002. The main shaft 8 of the spherical pump in each blood pump 100 is connected to the axle of the driven gear 2002 and is driven by the driven gear 2002; the gear mechanism is arranged in the gearbox 200.

[0080] In this embodiment, the initial phase angles of the blood pumps 100 differ by 180 / N degrees in sequence, where N is a positive integer greater than or equal to 1. The blood pumps 100 can be used alone or in combination. For a single pump, the liquid output flow rate is close to a sine curve and the flow pulsation is relatively large. N is preferably selected as 2, 4, 6, or 8. For a four-pump combination, the combined flow pulsation is relatively smooth. In this embodiment, a four-pump combination is preferably used.

[0081] Connect the liquid inlet holes of all the blood pumps 100 to the same liquid inlet pipe, and connect the liquid discharge holes of the N blood pumps 100 to the same liquid discharge pipe.

[0082] The blood pump 100 provided in this embodiment has excellent flow output characteristics. After being combined into a blood pump group, the flow pulsation is small, so the system pressure and flow rate are stable and the noise is low. At the same time, the requirements for the motor or other power input devices are reduced, the load condition of the motor is optimized, there is no peak fluctuation, and the peak power of the motor is reduced, the cost of the motor is reduced, and the service life of the motor is increased. At the same time, the four-pump combination can increase the blood flow rate. Under the condition of meeting the total flow rate, the rotation speed of a single pump can be reduced, the wear of blood cells is reduced, and the rise of the temperature of the pump and blood is avoided.

[0083] According to the theory of the spherical compressor, when the main shaft of the spherical pump rotates 360 degrees, the piston and the turntable rotate 360 degrees to complete a complete working cycle. For the blood pump 100 in this embodiment, when the blood pump 100 completes a complete working cycle, the V1 working chamber and the V2 working chamber of the blood pump 100 respectively perform a complete liquid suction and discharge operation, that is, a working cycle occurs in the V1 working chamber and the V2 working chamber respectively. Therefore, when the main shaft rotates one week, the blood pump 100 performs a complete liquid suction and discharge process.

[0084] For the combination of N blood pumps, the axes of the main shafts of the N blood pumps are evenly distributed along the same circumference, and the axes of the main shafts 8 of the N blood pumps 100 are parallel. When the motor drives the driving gear 2001 to rotate, the driving gear 2001 simultaneously drives several driven gears 2002, and the main shaft of each blood pump 100 is connected to the axle of the driven gear 2002 and is driven by the driven gear 2002.

[0085] For the blood pump group with a four-pump combination, the starting angles between the main shafts 8 of the four blood pumps 100 differ by 45 degrees in sequence.

[0086] In this embodiment, when the single blood pump 100 has a flow rate of 100 milliliters per minute, the ball diameter of the turntable is only 30 millimeters and the rotation speed is 60 revolutions per minute. If it is a four-pump combination structure, the rotation speed only needs to be 15 revolutions per minute. The spherical blood pump of this patent has a low rotation speed and no eddy current, avoiding the rise of blood temperature caused by pump heating and the damage to blood cells.

[0087] In summary, this patent provides a blood pump and a blood pump group. By providing a blood sac adapted to the spherical pump working chamber cavity therein, the blood sac is squeezed by the change in the volume of the spherical pump working chamber. The squeezing process is slow, and the blood sac is evenly stressed, avoiding damage to red blood cells and white blood cells caused by local stress. The degree of squeezing of the blood is relatively small. At the same time, the spherical pump is provided with a liquid inlet hole and a liquid outlet hole, which are connected to the blood sac through a flow distribution mechanism, avoiding the squeezing of red blood cells and white blood cells by the valve body when the blood passes through the valve, and realizing low damage to red blood cells and white blood cells.

Claims

1. A blood pump, characterized in that: It comprises a spherical pump, which has two working chambers with alternately changing volumes; a blood bag adapted to the working chamber cavity is provided in each of the working chambers, and the volume of the blood bag alternately inhales and discharges blood following the change of the working chamber volume; each of the blood bags is provided with an inlet pipe for blood entry and a discharge pipe for blood discharge; the surface where the upper ports of the inlet pipe and the discharge pipe are located after penetrating the piston of the spherical pump is set as a distribution surface; a distribution mechanism is formed between the distribution surface and the matching surface of the cylinder cover of the spherical pump; when the spherical pump is working, the inlet hole of the spherical pump is selectively connected with the inlet pipe of the blood bag through the distribution mechanism to form a blood channel, and the discharge hole of the spherical pump is selectively connected with the discharge pipe of the blood bag through the distribution mechanism to form a blood channel.

2. A blood pump according to claim 1, characterized in that: The flow distribution mechanism is a cylindrical flow distribution mechanism, and the cylindrical flow distribution mechanism includes: An outer cylindrical distribution surface, wherein the outer cylindrical surface where the upper ports of the liquid inlet pipe and the liquid discharge pipe penetrate the piston of the spherical pump is located is used as the distribution surface, and the distribution surface is recorded as the outer cylindrical distribution surface; An inner cylindrical matching surface, an inner cylindrical matching surface adapted to the outer cylindrical distribution surface is provided on the cylinder cover of the spherical pump; the inner cylindrical matching surface is in contact with the outer cylindrical distribution surface to form a sealed rotation fit; an inlet groove I and a discharge groove I are provided on the inner cylindrical matching surface, an upper port of the inlet pipe corresponds to an inlet groove I, an upper port of the discharge pipe corresponds to a discharge groove I, the inlet groove I and the discharge groove I are respectively connected to the inlet hole and the discharge hole of the spherical pump, thereby forming a cylindrical distribution mechanism between the outer cylindrical distribution surface and the inner cylindrical matching surface.

3. A blood pump according to claim 1, characterized in that: The flow distribution mechanism is a planar flow distribution mechanism, and the planar flow distribution mechanism includes: A plane distribution surface, wherein the surface where the upper ports of the liquid inlet pipe and the liquid discharge pipe penetrate the piston of the spherical pump is located is used as the distribution surface, and the distribution surface is recorded as a plane distribution surface, and the plane distribution surface is the upper end surface of the piston; a liquid inlet groove II and a liquid discharge groove II are provided on the plane distribution surface, an upper port of a liquid inlet pipe is connected to a liquid inlet groove II, and an upper port of a liquid discharge pipe is connected to a liquid discharge groove II; A planar distribution plate is provided between the planar distribution surface and the cylinder cover of the spherical pump; the lower end surface of the planar distribution plate is in contact with the planar distribution surface to form a sealed rotation fit, and the planar distribution plate is elastically pressed between the cylinder cover and the planar distribution surface; a liquid inlet and a liquid discharge port are provided on the planar distribution plate, one of the liquid inlets corresponds to a liquid inlet groove II, and one of the liquid discharge ports corresponds to a liquid discharge groove II, and the liquid inlet and the liquid discharge port are respectively connected to the liquid inlet hole and the liquid discharge hole of the spherical pump, thereby forming a planar distribution mechanism between the planar distribution surface and the planar distribution plate.

4. A blood pump according to claim 1, characterized in that: The blood bag is made of soft elastic material; the blood bag is fixedly connected to the upper end surface and the lower end surface of the working chamber respectively.

5. A blood pump according to claim 1, characterized in that: The liquid inlet pipe on the blood bag is arranged at the front end of the blood bag in the direction of rotation of the piston, and the liquid discharge pipe of the blood bag is arranged at the rear end of the blood bag in the direction of rotation of the piston.

6. A blood pump according to claim 1, characterized in that: A blood passage is arranged in the blood bag, the inlet of the blood passage is communicated with the liquid inlet pipe, and the outlet of the blood passage is communicated with the liquid discharge pipe.

7. A blood pump according to claim 1, characterized in that: The ball pump comprises: The cylinder body has a hemispherical inner cavity and is provided with a through hole penetrating the outside of the cylinder; The turntable has a spherical outer peripheral surface, which has the same spherical center as the hemispherical inner cavity and forms a sealed dynamic fit; the upper part of the turntable is provided with two side surfaces at a certain angle, and a turntable pin seat is provided in the center of the two side surfaces; a turntable shaft protrudes from the center of the lower end of the turntable, the turntable shaft passes through the spherical center of the spherical outer peripheral surface, and a sliding shoe is fixed to the lower end of the turntable shaft; The piston has a cylindrical outer peripheral surface, and the central axis of the cylindrical outer peripheral surface is used as the piston axis. A piston pin seat is fixed to the lower end surface of the piston, and the piston pin seat is connected to the turntable pin seat in a cylindrical hinge. The piston axis passes through the center of the spherical outer peripheral surface of the turntable; A cylinder cover having an inner cylindrical hole adapted to the cylindrical outer peripheral surface of the piston, a lower end of the cylinder cover being fixedly connected to an upper end of the cylinder body, and a liquid inlet hole and a liquid discharge hole being provided on the cylinder cover; The spindle and the spindle bracket are fixedly connected to the lower end of the cylinder body, and the spindle bracket provides support for the rotation of the spindle. A slide groove is provided on the upper end surface of the spindle, and the sliding shoe at the lower part of the turntable is placed in the slide groove to form a sliding fit. The lower end of the spindle extends out of the cylinder from the through hole at the lower end of the cylinder body and is connected to the driving element. Among them, the axis of the main shaft and the axis of the piston both pass through the center of the spherical outer peripheral surface; the axis of the piston and the axis of the turntable shaft form the same angle α with the axis of the main shaft; the two parallel side surfaces of the sliding shoe are symmetrically arranged on both sides of the axis of the turntable shaft and are parallel to the axis of the cylindrical hinge; when the main shaft drives the turntable and the piston to rotate, the sliding shoe slides back and forth in the sliding groove, and two working chambers with alternating volumes are formed between the upper end surface of the turntable, the lower end surface of the piston and the hemispherical inner cavity of the cylinder body.

8. A blood pump set, characterized in that: It comprises N blood pumps as described in any one of claims 1 to 7, wherein the liquid inlets of the N blood pumps are all connected to the same liquid inlet connecting pipe, and the liquid discharge holes of the N blood pumps are all connected to the same liquid discharge connecting pipe; wherein N is a positive integer greater than or equal to 1.

9. A blood pump set as claimed in claim 8, characterized in that: The N blood pumps are connected via the same driving mechanism, and the driving mechanism is used to drive the N blood pumps to rotate in coordination; the initial phase angles of the blood pumps in the blood pump group differ by 180 / N degrees respectively.

10. A blood pump set as claimed in claim 9, characterized in that: The driving mechanism is a gear mechanism. The main shaft of each blood pump is connected to a driven gear, which meshes with a driving gear. The driving gear is driven by a motor, and the driving gear simultaneously drives several driven gears and the main shaft of the blood pump to rotate in coordination.

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